package com.jielihaofeng.listener;

import com.rabbitmq.client.Channel;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.listener.api.ChannelAwareMessageListener;
import org.springframework.stereotype.Component;

/**
 * @author Johnnie Wind
 * @description
 * @date 2021/11/30 09:53
 */
/*
 * Consumer ACK机制：
 *   1、设置手动签收。acknowledge=“manual”
 *   2、让监听器类实现ChannelAwareMessageListener接口
 *   3、如果消息成功处理，调用channel的basicAck()签收
 *   4、如果消息处理失败，则调用channel的basicNack()拒绝签收，broker重新发送给consumer
 * */
@Component
public class AckListener implements ChannelAwareMessageListener {

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {
        Thread.sleep(1000);
        long deliveryTag = message.getMessageProperties().getDeliveryTag();

        try {
            //1.接收转换消息
            System.out.println(new String(message.getBody()));

            //2.处理业务逻辑
            System.out.println("处理业务逻辑...");

            // 测试异常情况
//            int i = 3/0;//出现错误

            //3.手动签收
            channel.basicAck(deliveryTag, true);
        } catch (Exception e) {

            //4.拒绝签收
            /*
             * 第二个参数：multiple
             * 第三个参数：requeue：重回队列。如果设置为true，则消息重新回到queue，broker会重新发送该消息给消费端
             *
             * */
            channel.basicNack(deliveryTag, true, true);
            //channel.basicReject(deliveryTag,true);只允许单挑确认
        }
    }
}
